Cleaning scraper for excavators



May 13,1924.

1,493,530 G. H. GREIMAN CLEANING SCRAPER FOR EXCAVATORS Filed March 16. 1923 I IHIIIL v um ' /mm '1; LL'lllllll r I' '22 @2155; 6 7% M T 0 all whom it may concern:

Patented May 13, 1924.

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CLEANING soaArER roa nxoeva'roaas.

Application filed March 16, 1923. Serial No. 625,575.

Be it known that I, GEORGE H. GREIMAN, a citizen of the United States, residing at Garner, in the county of Hancock and State of Iowa, have invented certain new and useful Improvementsin Cleaning Scrapers for Excavators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention provides animproved cleaning device or scraper for excavators of the power driven type, vices, variously indicated as shovels, spades, or scoops, the nature of an improvement on or modification of the scraper disclosed and broadly claimed in my, U. S. Letters Patent #1,- MQQQAE, issued March 20, 1923 and entitled Cleaning scraper for excavators) A commercial form. of the inventionis buckets,

illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings: Fig. l is aqplan view, with some parts sectioned and someparts broken away, show ing portions of the framework and of the elevator of an excavator and showing a pair of. my improved scrapers operatively applied to the elevator; :and

Fig. 2 is a vertical section on the line 2 2 of Fig. 1. I I v The numeral 3 indicates the frame struc ture of an excavator, .to the rear portion of which is secured axially aligned-laterally spaced shaft bearings 4 in which, a powerdriven shaft 5 is journaled.

A vertically oscillatory excavator boomis shown-made up oflaterally spaced beams 6 rigidly tied together by cross bars 7. The

beams 6, at. their upper ends, are provided shaft 5 or otherwise arranged to move concentrically around the axis of said'shaft.

Between the beams, the shaftfi is provided with aheavy sprocket wheel 9. The excavator belt 10, in the form of a heavy link or sprocketichain, is arranged to run over the sprocket '9. and over a similar sprocket, not shown but which, in practice, is suitably boom. y

Certain of thelinks of the belt or chain 10 are provided with fiat outstanding arms wherein excavating deare employed, and is in mounted at the free end of the.

11, which, at their outer ends, carry curved.

excavator scoops or spades 12 of a character that will pick up the load at their front edges and discharge the same at their rear lower edges, the discharge taking place as the scoops or spades-make the upward turning movement around the shaft 5 and sprocket 9. 1 i

The scoops or spades 12 project laterally -on opposite sides of their arms 11 and, hence, for. commingllng the 1nner surfaces of these scoops or spades, I provide a pair of laterally spaced cleaning scrapers located one on each side of the sprocket 9. In the arrangement illustrated, each scraper comprises an arm intermediately pivoted on or around the shaft 5 and provided at each end with a scraper blade. In the commercial form of the scraper, each arm is made up of two channel bars 13, the inner ends of which are overlapped and rigidly connected at 14 byrivets or bolts and between said' rivets or bolts are split to form an. elongated loop 13*. The loop 13* embraces the shaft 5 and, by trunnions 15, are pivoted to bearing sleeves 16, which, in turn, are journaled on the shaft 5. By this arrangement, the arm 13, by virtue of its trunnions 15, is pivoted for lateral oscillatory movements and by its sleeve 16'is arranged to rotate on the shaft 5. As shown, the

bearing sleeve 16 is split or divided, the" sections thereof being rigidly connected by small nut-equipped bolts 17 To the opposite ends of the arm 13 are secured scraper blades18, the rectangular corners of which are arranged to work close to the inner surfaces of the scoops or spadeslQ and close tothefcarrying arms 11,,as best shown at the left in Fig. 1. The arrangements of the twoscrapers on the opposite sides of the sprocket 9 are the same and as above described, but they are in reverse relation sothat the scraper blades 18, when turned away H from their operative positions, as

shown at the right in. Fig. 1, will be posi tioned with their outer edges reversely' oblique to the axis ofthe shaft5. To act upon these oblique edges in the. position just stated,I provide stop devices in the form of beveled rollers 19 journaled on a non-rotary spindle 20, the outer ends of which-are mounted for sliding movements in elongated seats formed between the under edges'of the beams 6 and the upper'edges of U-shaped guide straps or brackets 21that are rigidly secured at their ends to said beams. The spindle 20 is positively held against rotation, but permitted sliding movements in a general direction toward and from the shaft 5, by anchoring pins 22, the ends of which are secured to crossbars 23 rigidly attached to the under edges ,of the beams 6. Coiled springs 24, placed around the pins 22 and compressed between the brackets 23 and the ends of the spindle 20, yieldingly press the latter toward the shaft 9 and hold the stop rollers 19 positioned to intercept the blades 18 and thereby stop and yieldingly hold the scrapers in their operativc positions shown in the drawings. As shown, the movement of the spindle 20 toward the shaft 9- is limited by small stop pins 25 and 26 applied in the outer ends of the pins 22.

Rigidly secured to the non-rotary spindle 20, just inward of the stop rollers 19, are segmental cams 27, the function of, which will presently appear.

By'reference to, Fig. 1, it will be noted that the adjacent inner edges of. the scraper blades 18, when in operative position as shown at the left in Fig. 1, are spaced apart much lessthan the width of the chain or belt 10 and that, hence, to permit rotation of the scraper arms 13 around the shaft 5, it will be necessary for said blades to separate or move laterally away from each other. It is also evident that force will be required to hold the scraper blades 18 positioned as shown at the left in Fig. 1.while performing the scraping action. With the arrangement described, when the scraper blades are moved ina clockwise direction in respect to Fig. 2,.toward their-operative positions, the opposite or inoperative bladeslS will come into engagement with the cams 27 and the latter will force the engaged blades outward and the operative blades inward to the operative positions shown atthe left in Fig. 1,

and the bevel on the stop rollers 19, acting on the, inoperative blades 18,,will prevent the operative blades at the left from'being forced too nearly together or so closely together as to come into contact with the spade-carrying arms: 11., Also, the rollers 19, operating as just described, will intercept rotation of the double-ended arms 13 around the shaft 5 and will stop and yieldingly hold the operative scraper blades positioned .as shown at the left in Fig. 1.

If,- while performing the scraping or scraper-cleaning action, a;rock 'or the like shouldv be wedged against an operating scraper blade, the excessive force will cause theparticular arm 14 to rotate on the shaft 5., To permit this rotation of the arm,it is necessary to press the cooperatingstop collar 19; out of the pathofjmovement of the so-called inoperative blade, and it; will be understood that the'ten'sion o'fthe'sprin'g' 29 blades will move the latter laterally away,

from the chain so that neither it nor its carryingarm 13 will be engaged with the chain in passing the line of the chain. However, ifthedirt should notproduce this movement, no harm would be done because the scraper arm would be released and would move freely outward when brought into any contact with the chain. When one of the scrapers has been tripped as above described, its carrying arm 13 will'ma'ke onehalf rotation and will be again stopped by the cooperating roller 19.

With the above described arrangement, it is not necessary that when one scraper is tripped that the other also be tripped, for the two scrapers are capable of independent rotation, independent oscillation and independent tripping actions.

What I claim is:

1. In an excavating mechanism, the combination with a scoop-equipped excavator belt, of a rotary scoop-cleaning device having circumferentially spaced scraper blades adapted to be operatively positioned in succession, the said cleaning device having a lateralswinging as well as rotary motion, and a yielding stop normally operativeon said cleaning device and adapted to yield and clear the same under excessive pressure.

2. In an excavating mechanism, the combination with a shaft, a wheel on said shaft, a scoop-equipped excavator 'belt movable over said f wheel, a scoop-cleaning device rotatively "mounted around the axis of said shaft and having circumferentially spaced.

scraper blades adapted to be operatively positioned in succession, saidcleaning devicehaving a lateral'swinging as well as rotary motion, and ayielding stop normally operative on the inactive scraper portion of v said cleaning device and adapted toyield and clear the same under'excessive pressure.

3; The structure defined in claim tin furthercombination with a relatively fixed cam member operative on said'cleaning deviceto normally hold the same with one scraper blade positioned foraction' but permitting said cleaning. device to swing laterally when thelatter is rotated.

4-. The structure defined in claim 2 in further,7 combination with a relative] fixed cam member operative on said cleaning device to normally hold the same with one '6. The structure defined in claim 1 in which cleaning devices of the character therein defined are arranged one on each side of said excavator belt.

7. The structure defined in claim 3 in which cleaning devices of the character therein defined are arranged one on each side of said excavator belt.

8. The structure defined in claim 2 in which said yielding stop comp-rises a springpressed receding spindle held against rotation, and a stop roller journaled on said spindle.

9. The structure defined in claim 3 in which said stop device comprises a springpressed receding spindle held against rotation, and a stop roller journaled on said spindle, the said cam devices being supported from said non-rotary spindle.

10. In an excavating mechanism, the combination with a shaft, a wheel on said shaft, an excavator belt movable over said wheel and provided with outstanding arms equipped at their outer ends with curved excavator spades projecting on both sides of said arms, sleeves rotatively mounted on said shaft adjacent the opposite sides of said wheel, arms intermediately pivoted to said sleeves, scraper blades on the outer ends of said arms operating to clean the concave surfaces of said excavator spades, and yielding stops and relatively fixed cam elements operative on the inactive scraper blades to hold the active scraper blades in operative positions against both rotary and lateral movements. I

11. In an excavating mechanism, the combination with a shaft, a wheel on said shaft, an excavator belt movable over said wheel and provided with outstanding arms equipped at their outer ends with curved excavator spades projecting on both sides of said arms, sleeves rotatively mounted on said shaft adjacent the opposite sides'of said wheel, arms intermediately pivoted to said sleeves, scraper blades on the outer ends of said arms operative to clean the concave surfaces of said excavator spades, a transverse non-rotary spring-pressed receding spindle adjacent the inactive scraper blades, and cooperating stop and cam-acting devices on said spindle operative on the in-- active blades to yieldingly hold the same and the active blades against both rotary and lateral movements.

12. In an excavating mechanism, the com bination with a shaft, a wheel on said shaft,

an excavator belt movable over said wheel and provided "with outstanding arms equipped at their outer ends with curved excavator spades projecting on both sides of said arms, sleeves rotatively mounted on said shaft adjacent the opposite sides of saidwheel, arms intermediately pivoted to said sleeves, scraper blades on the outer ends of said arms operative to clean the concave surfaces of said excavator spades, a trans verse non-rotary spring-pressed receding spindle adjacent the inactive scraper blades, and beveled stop rollers and fixed cams on said spindle operative on the inactive scraper blades to hold the same and the active scraper blades against both rotary and lateral swinging movements.

In testimony whereof I afiix my signature. r

GEORGE H. GRE IMAN. 

